JP5822399B2 - Soap mold - Google Patents

Description

  The present invention relates to a mold used for manufacturing soap.

  As a soap manufacturing method, a mold in which a set of split molds are assembled to form a molding cavity and an injection space for a liquid raw material such as molten soap positioned below the cavity and leading to the cavity There is known a method (filling molding method) in which a liquid raw material is filled into the cavity through the injection space and cooled and solidified. This mold has a split parting for the purpose of eliminating inconveniences (insufficient filling of liquid material, etc.) caused by the air in the cavity not being able to escape when the liquid material is filled into the cavity. An air vent (vent hole) for discharging the air in the cavity is formed on the surface, and the liquid raw material filled in the cavity through the injection space located below the cavity is separated from the air in the cavity. After being replaced, the air is discharged to the outside through an air vent disposed above the cavity.

  Patent Documents 1 to 4 describe air vent improvement techniques for resin molding dies. In Patent Document 1, a gas discharge groove is formed in a mold mounted in a state in which a set of two nestings is assembled so as to surround the nesting, and a plurality of minute portions are formed on a parting surface of the nesting. The formation of grooves is described. According to Patent Document 1, when a liquid material is injected into a cavity, the gas in the cavity is discharged to the outside through the minute groove and the gas discharge groove by the pressure.

  In Patent Document 2, a plurality of continuous chevron grooves along the parting surface are formed in the air vent formation region in each parting surface of a set of molds, and the parting surfaces of both molds are separated from each other. It is described that the chevron grooves of both molds mesh with each other while forming a predetermined gap. According to Patent Document 2, the angle groove portion of the air vent is formed in order to solidify the bath water filled in the cavity at the angle groove portion to prevent a bath water jetting accident.

  In Patent Document 3, an air vent formation region on a parting surface of one mold of a set of molds is formed on a rough surface that allows a gas generated from a molten molding material to pass through. It is described that the exhaust efficiency is improved.

  Patent Document 4 has a problem that a part of the injected molten resin protrudes outside the cavity in the mold, and so-called burrs are generated in a set of two molds for injection molding. In view of the above, in order to suppress the occurrence of burrs in the molded product, it is described that a mold having a configuration in which the parting surfaces of both molds abut only at the parting abutment area in the peripheral area of the cavity is described. Further, in the mold having such a configuration, when the gas vent groove formed by air venting is radially formed in the parting contact region, the gas vent groove is crushed and deformed by repeated injection molding, and the gas venting effect is obtained. In view of the possibility that the gas will decrease, it is described that a gas vent groove is not formed in the vicinity of the periphery of the cavity.

JP-A-11-90609 Japanese Patent Laid-Open No. 7-116807 JP-A-10-291238 JP 2010-131790 A

  In the manufacture of soap by the above-described filling molding method, the air vent clearance (size of the air hole), shape, etc. of the mold used greatly affects the quality of the product (soap). For example, if the clearance of the air vent is too small, the air in the cavity cannot be sufficiently removed, causing a short mold, a transfer failure, and the like, resulting in a poor appearance of the product. On the other hand, if the clearance of the air vent is too large, part of the liquid raw material protrudes from the cavity and burrs are generated in the product. Therefore, it is necessary to remove the burrs in the subsequent process, which complicates the manufacturing process. In addition, since a small amount of soap residue remains in the air vent after one manufacturing process in the intermediate clearance between these steps, when soap is continuously manufactured using a single mold, May adversely affect (filling).

  Thus, it is difficult to efficiently produce high-quality soap only by adjusting the clearance of the air vent. Further, the air vent improvement techniques described in Patent Documents 1 to 4 relate to a resin molding die using a molten resin as a raw material. Generally, a molten soap used as a soap raw material has a viscosity higher than that of the molten resin. Therefore, even if the air vent improvement technology described in Patent Documents 1 to 4 is applied to a soap mold, there is a risk that clogging of the air vent may occur due to the difference in liquid raw materials. Yes, the expected effect is not obtained. A soap mold that reliably vents the cavity and suppresses the generation of burrs in the product and obtains high productivity has not yet been provided.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a soap mold that reliably removes air from a cavity and suppresses the generation of burrs in a product, thereby obtaining high productivity.

  The present invention comprises a first mold having a parting surface and a second mold, and is molded inside by abutting the first mold and the second mold at their parting surfaces. And a liquid source injection space leading to the cavity and an air vent for discharging the air in the cavity are formed, and the injection space is located below the cavity, and the air vent is located above the cavity. A plurality of linear grooves extending along the air discharge direction in a region where the air vent is formed on the parting surface of one of the two molds, In a cross-sectional view along the orthogonal direction, a chevron is formed between the two linear grooves adjacent to the orthogonal direction and formed in a direction orthogonal to the orthogonal direction. The line The groove is cut inward in the thickness direction of the one mold, and the chevron protrudes outward in the thickness direction, and the parting surface of the other mold of the two molds, The groove facing region that faces the plurality of linear grooves when the parting surfaces of both molds are abutted to each other to form the cavity solves the problem by providing a soap mold that is flat. It is.

  According to the soap mold of the present invention, the air in the cavity is surely vented, and the occurrence of burrs in the product is suppressed, so that high productivity can be obtained.

FIG. 1 is a schematic side view of a soap molding apparatus according to an embodiment of the present invention and a soap manufacturing apparatus including a mold opening / closing means and an injection means (a cross-sectional view of the mold and the injection apparatus). 2 is a schematic cross-sectional view of the mold shown in FIG. 1 in a closed state (a state in which the first mold and the second mold are abutted). FIG. 3 is a schematic perspective view of the mold shown in FIG. 1 in an open state (a state where the first mold and the second mold are separated). 4 is a schematic top view of a part of the mold shown in FIG. 1 in a closed state. FIG. 5 is a schematic plan view of the parting surface of the first mold in the mold shown in FIG. 6 is a cross-sectional view schematically showing a cross section taken along line II of FIG. FIG. 7 is a view corresponding to FIG. 6 showing a modification of one mold (first mold) of the soap mold of the present invention. FIG. 8 is a cross-sectional view corresponding to FIG. 6 of a mold outside the scope of the present invention. FIG. 9 is a schematic diagram showing the state of the mold and the injection means at the start of molding of the soap manufacturing apparatus shown in FIG. FIG. 10 is an enlarged view of a main part of FIG. FIG. 11 is a view corresponding to FIG. 10 schematically showing a state in which the liquid raw material is supplied into the mold. FIG. 12 is a schematic diagram showing a state in which filling of the liquid raw material into the mold is completed in the soap manufacturing apparatus shown in FIG. 1. FIG. 13 is a schematic diagram showing a state in which the mold is opened in the soap manufacturing apparatus shown in FIG. FIG. 14 is a schematic side view of a solid soap manufactured using the soap manufacturing apparatus shown in FIG. 1. FIG. 15 is a diagram showing a part of another embodiment of the molding die according to the present invention, and is a schematic cross-sectional view showing a state in which the first die and the second die constituting the molding die are butted together. is there. FIG. 16 is a schematic cross-sectional view of the natural state of the first mold in the mold shown in FIG.

  Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings. The principal part of one Embodiment of the soap manufacturing apparatus provided with the shaping | molding die of this invention is shown by FIG. A manufacturing apparatus 5 shown in FIG. 1 includes a mold 1 used for molding molten soap (liquid raw material), mold opening / closing means 2 for opening and closing the mold 1, and molten soap in the mold 1 (cavity). And injection means 3 for injecting. Molten soap is a liquid raw material that solidifies upon cooling. By operating the manufacturing apparatus 5, the molten soap is cooled and solidified to form a solid soap (molded body) having a predetermined shape.

  As shown in FIG. 2, the mold 1 has a plurality of molding cavities 10 filled with molten soap, and as shown in FIG. 3, a set of two having a parting surface PL. A first mold 1A and a second mold 1B are provided. Both molds 1A and 1B have a rectangular block shape made of a rigid body such as metal, and a plurality of concave cavity forming surfaces 11A and 11B are formed on each parting surface PL. The formation surfaces of the cavities (hereinafter also referred to as cavity formation surfaces) 11A and 11B have the shape of soap to be manufactured as shown in FIG. 2 when both molds 1A and 1B are brought into contact with their parting surfaces PL. A plurality of matched cavities 10 are formed (in this embodiment, 12).

  The plurality of cavity forming surfaces 11 </ b> A are arranged in rows in the vertical direction Z of the mold 1 and the horizontal direction Y orthogonal to the vertical direction Z with a predetermined interval. In the present embodiment, the rows formed by arranging the two cavity forming surfaces 11A along the vertical direction Z are arranged in parallel in six rows at a predetermined interval in the left-right direction Y. A plurality of cavity forming surfaces 11B are also arranged in the same manner. Therefore, as shown in FIG. 2, in the state where the first mold 1A and the second mold 1B are abutted with each other on their parting surfaces PL, a plurality (12) of cavities are provided in the vertical direction Z and the horizontal direction Y, respectively. They are arranged in rows at a predetermined interval.

  Further, as shown in FIG. 2, in a state where the first mold 1 </ b> A and the second mold 1 </ b> B are abutted with each other on their parting surfaces PL, in addition to the cavity 10, it communicates with the cavity 10. An air vent (vent hole) 15 for discharging the molten soap injection space 12 and the air in the cavity 10 is formed. The injection space 12 is located below each of the plurality of cavities 10, and the air vent 15 is located above each of the plurality of cavities 10. Moreover, although not shown in figure, the block which comprises both mold | types 1A and 1B is provided with the circulation path of the cooling water.

  The injection space 12 includes a runner 12A extending downward from the lower portion of the cavity 10 and a spool 12B orthogonal to the runner 12A and extending in the butting direction X when the both molds 1A and 1B are butted. 1 is substantially L-shaped in a cross-sectional view (a cross-sectional view in a direction orthogonal to the parting surface PL). The runner 12 </ b> A extends substantially vertically from the lower portion of the cavity 10 to the vicinity of the lower surface 1 b of the mold 1. The spool 12B extends substantially horizontally from the lower end of the runner 12A to the outer surface of the molding die 1 (the rear surface opposite to the parting surface PL of the second die 1B). As will be described later, the molten soap is filled upward from the lower portion of the cavity 10 through the injection space 12 including the runner 12A and the spool 12B.

  As shown in FIG. 3, the runner 12A is formed by cutting out part of the parting surface PL of the first mold 1A. The runner 12A has a cross-sectional shape in which a part of a circle is cut out along the parting surface PL, and the diameter thereof is substantially constant over the entire length of the runner 12A. One end (upper end) of the runner 12A is opened at the cavity forming surface 11A to form a gate, and the other end (lower end) is closed. The spool 12B is formed with a through-hole penetrating the die 1B in the thickness direction at a predetermined portion of the second die 1B, and the spool bush 14 having the spool 12B as shown in FIG. The end of the spool bush 14 on the back side of the second die 1B is a molten soap injection port 16. The diameter of the spool 12B is gradually reduced toward the back side (injection port 16) of the second die 1B.

  When the first mold 1A on which the runner 12A is formed is viewed from the back surface located on the opposite side of the parting surface PL, the runner 12A is connected to the portion corresponding to the runner 12A (runner forming surface) from the back surface. A slit 13 having a fine width reaching 12A is formed (see FIG. 2). In the present embodiment, as shown in FIG. 2, the slit 13 is formed not only in the portion corresponding to the runner 12 </ b> A but also in the portion corresponding to the cavity 10 (cavity forming surfaces 11 </ b> A and 11 </ b> B). The plurality of slits 13 in the first mold 1A extend substantially horizontally from the cavity forming surface 11A or the runner forming surface to the back surface of the mold 1A. The plurality of slits 13 in the second mold 1B extend substantially horizontally from the cavity forming surface 11B to the back surface of the mold 1B. As will be described later, the slit 13 is used when the mold 1 is opened after the molten soap is solidified in the mold 1 to form a solid soap. Used for suction and air blowing. The width of the slit 13 is preferably 10 μm or more and 100 μm or less.

  As shown in FIG. 3, grooves 17 </ b> A and 17 </ b> B crossing the parting surface PL in the left-right direction Y are provided at substantially the center in the vertical direction Z of the first mold 1 </ b> A and the second mold 1 </ b> B. Are formed in a straight line in the left-right direction Y. When both molds 1A and 1B are brought into contact with each other by their parting surfaces PL as shown in FIG. An air discharge groove 17 composed of both grooves 17A and 17B is formed. Both ends of the air discharge groove 17 in the length direction are open and communicate with the outside of the mold 1.

  As shown in FIG. 2, the air vent 15 extends substantially vertically from the upper part of each cavity 10 in a state where the first mold 1 </ b> A and the second mold 1 </ b> B are abutted on their parting surfaces PL. The air vent 15 communicating with the cavity 10 (upper cavity 10) located above the air discharge groove 17 in the vertical direction Z is continuous between the upper part of the cavity 10 and the upper surface 1 a of the mold 1. In addition, the air vent 15 communicating with the cavity 10 (lower cavity 10) located below the air discharge groove 17 in the vertical direction Z is continuous between the upper portion of the cavity 10 and the air discharge groove 17. The upper cavity 10 and the lower cavity 10 communicate with the outside of the mold 1 through the air vent 15. It should be noted that the air vent 15 communicating with the upper cavity 10 and the air vent 15 communicating with the lower cavity 10 differ only in the connection destination on one end side (the upper surface 1a of the mold 1 or the air discharge groove 17), dimensions, shapes, etc. Are the same.

  As shown in FIGS. 3 to 5, the air vent 15 is formed by cutting out a part of the parting surface PL of the first mold 1 </ b> A. In the present embodiment, the air vent 15 is formed only on the parting surface PL of one of the molds 1A and 1B, and is not formed on the other mold 1B. The air vent 15 is formed in a region of the parting surface PL of the first mold 1A opposite to the runner 12A (the gate) across the cavity forming surface 11A. It has a rectangular shape having a predetermined clearance T (see FIG. 4) in a cross-sectional view in the orthogonal direction.

  In the present embodiment, the first mold 1A (one mold) includes a part 1A1 of the mold 1A including a region where the air vent 15 is formed on the parting surface PL (indicated by hatching in FIGS. 4 and 5). Part) is detachably attached to the other part 1A2 of the mold 1A. The first die 1A has an insertion hole 26 for a fixing means (not shown) such as a screw that penetrates the part 1A1 in the abutting direction X and reaches the part 1A1 of the other part 1A2. The part 1A1 is detachably fixed to the other part 1A2 via a fixing means (not shown) inserted into the insertion hole 26. The adjustment (fine adjustment) of the clearance T of the air vent 15 is performed, for example, on the side opposite to the parting surface PL of the part 1A1 (including the formation area of the air vent 15) of the first mold 1A manufactured in advance with a minus tolerance. The surface can be adjusted by mounting one or more thin plates processed to a desired thickness. Alternatively, a portion of the second mold 1B including a groove facing region 1B1 (to be described later) (a portion that faces the part 1A1 of the mold 1A when the cavity 10 is formed by abutting the parting surfaces PL of both molds 1A and 1B) ) May be configured to be mounted with the same thin plate as part 1A1. Thus, when the part 1A1 of the mold 1A including the region where the air vent 15 is formed is detachably attached to the other part 1A2 of the mold 1A, the air vent 15 from the parting surface PL side of the mold 1A. Maintenance work such as replacement of (part 1A1) and adjustment of the clearance W can be performed, and the maintainability of the mold 1 is further improved.

  As one of the main features of this embodiment, as shown in FIG. 4 and FIG. 6, the formation region of the air vent 15 on the parting surface PL of one of the molds 1A and 1B (first mold) 1A. Further, a plurality of linear grooves 18 extending along the discharge direction of air in the cavity 10 (vertical direction Z of the mold 1) are perpendicular to the discharge direction (the horizontal direction Y of the mold 1, the parting). A chevron 19 is formed between the two linear grooves 18, 18 that are formed continuously without being spaced apart in the plane direction of the plane PL and are adjacent to each other in the orthogonal direction, as shown in FIG. In the cross-sectional view along the orthogonal direction, the linear groove 18 cuts inward in the thickness direction (abutting direction X) of the one mold 1A, and the chevron 19 protrudes outward in the thickness direction. And the other type (second type) 1B party In the plane PL, grooves opposing region 1B1 facing the plurality of linear groove 18 at the time of forming the cavity 10 dies 1A, against was what parting face PL of the 1B include the point is flat. Three or more linear grooves 18 are formed. Accordingly, a plurality of chevron projections 19 are also formed.

  Each of the plurality of linear grooves 18 is continuous in a straight line parallel to the vertical direction Z in a plan view as shown in FIG. 5, and the total length of the air vent 15 in the air discharge direction (in the upper cavity 10 of the mold 1). In the air vent 15 that communicates, between the upper part of the cavity 10 and the upper surface 1 a of the mold 1, and in the air vent 15 that communicates with the lower cavity 10 of the mold 1, between the upper part of the cavity 10 and the air discharge groove 17. ). Each of the plurality of chevron projections 19 is also continuous straight and parallel to the vertical direction Z in the plan view, and is continuous over the entire length of the air vent 15 in the air discharge direction, like the linear groove 18. The plurality of linear grooves 18 have the same shape and dimensions, and therefore, the linear grooves 18 and the chevron projections 19 are the same in size, except that they are upside down. In the cross-sectional view along the orthogonal direction (left-right direction Y of the mold 1) as shown in FIG. 6, the linear groove 18 cut inward in the thickness direction (butting direction X) of one mold 1A is V-shaped. The chevron projections 19 projecting outward in the thickness direction have a triangular shape.

  As shown in FIG. 4, there is no step between the groove facing region 1B1 on the parting surface PL of the second die 1B (the other die) and the other region of the parting surface PL, and the party of the die 1B. The entire ring surface PL is a continuous flat surface with no steps. Further, in the present embodiment, as shown in FIG. 6, the tops of the plurality of chevron projections 19 are respectively located at positions lower than the parting surface PL of the first mold 1A (one mold) by a distance T. Therefore, as shown in FIG. 4, in a state where both molds 1A and 1B are butted against their parting surfaces PL, the top of the chevron projection 19 of the first mold 1A and the second opposite to this The groove facing region 1B1 of the mold 1B is not in contact with each other, and a clearance T substantially corresponding to the distance T is formed between the top and the groove facing region 1B1.

  As described above, in the formation region of the air vent 15 on the parting surface PL of one of the molds 1A and 1B, the plurality of linear grooves 18 and the chevron projections 19 are discharged from the air in the cavity 10 ( If uneven portions formed alternately in a direction perpendicular to the vertical direction Z) of the mold 1 (the horizontal direction Y of the mold 1) are formed, a party like a mold 1A 'shown in FIG. Compared to the case where no groove or protrusion is formed in the region where the air vent 15 is formed on the wrapping surface PL, and the region where the air vent 15 is formed is a flat portion 19 ′ having no irregularities, the boundary portion between the cavity 10 and the air vent 15. Since the cooling of the molten soap in Q (see FIG. 2) is further promoted, it is possible to effectively prevent the disadvantage that a part of the molten soap protrudes outside the cavity 10 and burrs are generated in the product. In addition, after the soap is manufactured using the mold 1, a small amount of soap residue remains in the air vent 15, and when the next soap is manufactured while it is left standing, the function of the air vent 15 is reduced due to the residual soap residue. Since the molten soap is not sufficiently filled due to (air discharge failure, etc.) and there is a risk of appearance defects such as short molds, the air vent 15 is used with a cleaning brush or the like each time one production is completed. The portion of the air vent 15 where the soap residue is likely to remain becomes an uneven portion composed of the linear groove 18 and the chevron 19 as in the present embodiment. If this is the case, it is easier to remove the residual soap residue with a cleaning brush or the like than when the portion is a flat portion 19 ′ (see FIG. 8) having no unevenness. Residual amounts of soap scum while being alleviated with malignant tumors is suppressed, reduced function of the air vent 15 due to residual soap scum can be effectively prevented. Therefore, according to the mold 1 of the present embodiment, the function by the air vent 15 (air venting in the cavity 10) is reliably performed, and generation of burrs in the product is suppressed, and high productivity is obtained.

  In particular, in the present embodiment, as described above, in the first mold 1A (one mold), the tops of the plurality of chevron projections 19 are each lower than the parting surface PL of the mold 1A by a distance T. Since it exists in a position (refer FIG. 6), as shown in FIG. 7, when the top part of the several peak-shaped processus | protrusion 19 exists in the same position as the parting surface PL, respectively (distance T = 0) (I) the flow rate per unit area of the discharged air is large and the air is more reliably vented from the cavity 10, and (ii) the pressure loss is small and the filling can be performed at a low pressure. As a result, it is possible to efficiently produce a high-quality soap having no appearance defect. The example shown in FIG. 7 is within the scope of the present invention as in the example shown in FIG. 6, and there is a point that the performance is inferior in comparison with the example shown in FIG. 6. Have.

  The manufacturing method of the mold 1 includes: A) a mold precursor in which the linear groove 18 and the chevron 19 are not formed in the region where the air vent 15 is formed on the parting surface PL [the first mold 1A (one mold)]. (Precursor) manufacturing step (mold precursor manufacturing step), and B) cutting the air vent formation region on the parting surface of the mold precursor (not shown) to form a filament in the formation region. And a step of forming the groove 18 and the chevron 19 (cutting step). In the mold precursor manufacturing process, a known mold manufacturing method used for manufacturing this type of mold can be used without particular limitation.

  In the cutting step, as a method of forming the linear groove 18 and the chevron 19 on the parting surface (air vent formation region) of the mold precursor (precursor of the first mold 1A), a cutter or the like can be used. There is a method of directly cutting the mold precursor using a cutting tool. Specifically, for example, a) in the cutting step, the mold precursor is set so that its parting surface is horizontal, and the linear grooves 18 and 18 are formed on the horizontal parting surface using a V cutter. A method for forming a predetermined number of chevron projections 19 and b) in the cutting step, the mold precursor is set so that its parting surface is inclined at 45 ° with respect to a horizontal plane, A method (step processing) in which a predetermined number of linear grooves 18 and chevron protrusions 19 are respectively formed on the inclined parting surface is used. Further, as another method for forming the linear groove 18 and the chevron 19, c) in the cutting step, by cutting the mold precursor, the linear groove 18 and the air groove forming region on the parting surface By obtaining a mold in which the chevron 19 is formed and performing electric discharge machining, rolling process, etc., the mold 1 in which the linear groove 18 and the chevron 19 are formed in the air vent formation region on the parting surface is obtained. A method of manufacturing one of the constituent molds (first mold) 1A is mentioned.

  Since the linear groove 18 and the chevron 19 are formed by such cutting, the bottom of the linear groove 18 and the top of the chevron 19, particularly the top of the chevron 19, are shown in FIGS. 6 and 7. However, in the present invention, the bottom of the linear groove 18 and the top of the chevron 19 have such a curved shape. May be.

From the viewpoint of ensuring the above-described effects of the air vent 15, it is preferable to set the dimensions of each part as follows.
The depth of the linear groove 18 (that is, the height of the chevron 19) D1 (see FIGS. 6 and 7) is preferably 10 μm or more, more preferably 30 μm or more, and preferably 60 μm or less, more preferably 50 μm or less. More specifically, it is preferably 10 μm or more and 60 μm or less, and more preferably 30 μm or more and 50 μm or less.
The pitch D2 (see FIGS. 6 and 7) of the linear groove 18 is preferably 80 μm or more, more preferably 100 μm or more, and preferably 200 μm or less, more preferably 150 μm or less, more specifically preferably 80 μm. It is 200 μm or less, more preferably 100 μm or more and 150 μm or less.

  The angle α at the bottom of the linear groove 18 and the angle β at the top of the chevron 19 (see FIGS. 6 and 7) are each preferably 67 ° or more, more preferably 80 ° or more, and preferably 169 ° or less. More preferably, it is 100 ° or less, more specifically, preferably 67 ° or more and 169 ° or less, and more preferably 80 ° or more and 100 ° or less. In the present embodiment, as described above, the plurality of linear grooves 18 have the same shape and the same size as each other. Therefore, the angle α at the bottom of the linear groove 18 and the angle β at the top of the chevron 19 are defined as follows. Are the same.

The distance T (see FIG. 6) of the top of the chevron 19 from the parting surface PL, that is, the clearance T (see FIG. 4) of the air vent 15 is preferably 5 μm or more, more preferably 10 μm or more, and preferably 25 μm. Hereinafter, it is further preferably 20 μm or less, more specifically, preferably 5 μm or more and 25 μm or less, and more preferably 10 μm or more and 20 μm or less.
The number of the linear grooves 18 in the formation area of the air vent 15 on the parting surface PL is preferably 50 or more, more preferably 66 or more, and preferably 125 or less per unit area of a square shape of 1 cm square. More preferably, it is 100 or less, more specifically, preferably 50 or more and 125 or less, more preferably 66 or more and 100 or less.

  The soap production apparatus 5 will be further described. The mold 1 is attached to the mold opening / closing means 2 as shown in FIG. Specifically, the lower part of the second mold 1B in the mold 1 is attached to a support plate 21 erected from the base plate 20, and is a fixed mold. On the other hand, the back surface of the first mold 1A is attached to a movable plate 24 connected to the servo motor 22 via a feed screw 23. The servo motor 22 is attached to a support plate 25 erected from the base plate 20 so that the feed screw 23 slides in a direction orthogonal to the movable plate 24. Accordingly, the first mold 1A is a movable mold that can move in the horizontal direction. The mold 1 is fixed so that each injection space 12 is located below each cavity 10 (each air vent 15 is located above each cavity 10). Accordingly, the molten soap is filled upward from the lower part of the cavity 10, and the air in the cavity 10 is discharged from the upper part of the cavity 10 through the air vent 15.

  A servo motor 22 for clamping the mold 1 and controlling the pressure of the cavity 10 is electrically connected to a control device (not shown). The control device includes a CPU such as a microcomputer that substantially controls the entire manufacturing device 5 including the servo motor 22, and a ROM that stores necessary fixed information such as a control program executed by the CPU and various data. A RAM used as a work area when the CPU executes processing, an input device for an operator of the control device, and the like.

  As shown in FIG. 1, the injection means 3 includes a plurality of nozzles 32 that correspond one-to-one with each of a plurality of cavities 10 (see FIG. 3) in one mold 1, and a main body provided with the nozzles 32. The injection part 39 is provided. The tip of the nozzle 32 is a portion that comes into contact with the mold 1 when the injection means 3 and the mold 1 are connected, and a supply port for molten soap (liquid raw material) is formed at the tip. A supply path for supplying molten soap to the nozzle 32 is formed inside the injection portion 39 (the main body of the injection means 3).

  More specifically, the injection means 3 includes a plurality (12 in the present embodiment) of molten soap injection portions 39 corresponding one-to-one to each of the plurality of cavities 10 (a plurality of injection spaces 12). The plurality of injection portions 39 are arranged in a row at predetermined intervals in each of the vertical direction Z and the horizontal direction Y of the mold 1, and the plurality of injection portions 39 in the second mold 1 </ b> B constituting the mold 1 (12 One-to-one correspondence with the opening portion of the spool 12B. Each of the plurality of injection portions 39 includes a supply pipe 30 having one end connected to the circulation line 42. A heat retention device such as hot water and a heater is attached to the circulation line 42 and the injection portion 39, and is maintained at a predetermined temperature. The other end of the supply pipe 30 is a liquid pool portion 31 that functions as a supply path for molten soap, and a nozzle 32 is projected from the liquid pool portion 31. Since the injection means 3 according to the present embodiment includes twelve injection portions 39, it includes twelve nozzles 32.

  In the nozzle 32, a push-in valve 33 having the same outer shape as the inner shape of the nozzle 32 is disposed. The valve 33 moves back and forth in the nozzle 32 by an air cylinder 38 attached to the rear end thereof. As the valve 33 moves backward, a gap is generated between the nozzle 32 and the valve 33, and the molten soap is supplied to the mold 1 through this gap. On the other hand, when the valve 33 moves forward, the nozzle 32 and the valve 33 are fitted together, there is no gap between them, and the supply of molten soap is stopped. That is, as the valve 33 advances and retreats, the molten soap is supplied and the supply is shut off.

  A cylinder 34 and a piston 36, which are examples of a constant capacity supply device, are attached to the supply pipe 30 at a position upstream of the nozzle 32 with respect to the flow direction of the molten soap (the direction indicated by arrow A in FIG. 1). . The cylinder 34 is provided so as to intersect with the supply pipe 30. A switching rotary valve 35 is disposed in the cylinder 34 to selectively communicate the upstream or downstream side of the supply pipe 30 with the cylinder 34 with the cylinder 34 as a boundary. At the same time, a piston 36 is arranged in the cylinder 34 so as to be able to advance and retreat in the cylinder. The cylinder 34 and the piston 36 constitute a constant capacity supply device for molten soap. The advance / retreat of the piston 36 is precisely controlled by a servo motor 37 attached to the rear end thereof. As the piston 36 moves backward, a space for accommodating the molten soap is formed in the cylinder 34. After this space is filled with molten soap, the piston 36 is pushed in, so that the molten soap is filled into the cavity 10 in the mold 1 under pressure. The supply volume of the molten soap to the cavity 10 is determined by the retreating distance or the pushing distance (stroke amount) of the piston 36. Specifically, 1) a method of determining the supply volume based on the retreat distance of the piston 36 with the position of the piston 36 before retreat as the origin, or 2) supply with the push-in distance of the piston 36 with the position of the piston 36 after retreat as the origin There is a method for determining the volume, and any method may be used.

  The plurality of injection portions 39 are attached to a frame body 61 erected from the base plate 60. The base plate 60 is placed and fixed on a slider 63 slidably disposed on a pedestal 62. The slider 63 is connected to a servo motor 64 placed on the pedestal 62 via a feed screw 65, and slides on the pedestal 62 by the operation of the servo motor 64. As a result, the plurality of injection portions 39 can be brought into and out of contact with the mold 1 attached to the mold opening / closing means 2.

  An embodiment of a solid soap manufacturing method using the soap manufacturing apparatus 5 having the above configuration will be described. First, in the mold open state of the mold 1 as shown in FIG. 2 is operated to push out the feed screw 23, the first die 1A fixed to the movable plate 24 is moved toward the second die 1B, and the parting surfaces PL of both die 1A and 1B are moved between each other. To close the mold 1A and the mold 1B as shown in FIG. Further, water is circulated in the cooling water circulation path described above. Further, the injection means 3 is arranged on the back side of the second mold 1B, the servo motor 64 of the injection means 3 is operated, and the slider 63 is slid toward the molding die 1, and as shown in FIG. The tip end of the nozzle 32 in each of the injection portions 39 and the opening portions of the plurality of spools 12B in the second die 1B are connected on a one-to-one basis.

  In the state shown in FIG. 9, the communication between the cylinder 34 and the circulation conduit 42 in each injection portion 39 is blocked by the rotary valve 35. The piston 36 disposed in the cylinder 34 remains in a predetermined position. Further, in this state, as shown in FIG. 10, the push-in valve 33 in each injection portion 39 is completely inserted into the nozzle 32 so that molten soap is not supplied.

  Under this state, a part of the molten soap circulating through the circulation pipe 42 is sent to each injection portion 39. In order to send the molten soap to each injection portion 39, the rotary valve 35 is rotated by a predetermined angle to cause the cylinder 34 and the circulation line 42 to communicate with each other. At the same time, the servo motor 37 is operated to retract the piston 36. Thereby, a space is formed in the cylinder 34, and the molten soap flows into the space. The retraction of the piston 36 is continued until a predetermined amount of molten soap is filled in the cylinder 34.

  When a predetermined amount of molten soap is filled in the cylinder 34, the operation of the servo motor 37 is stopped and the backward movement of the piston 36 is stopped. Next, the rotary valve 35 is inverted by a predetermined angle to cut off the communication between the cylinder 34 and the circulation conduit 42 and the cylinder 34 and the nozzle 32 are communicated. Subsequently, the air cylinder 38 is operated to pull out the valve 33 from the nozzle 32, and a gap is formed between them. This state is shown in FIG. As a result, a supply path for molten soap is formed that includes the cylinder 34, the supply pipe 30, the liquid reservoir 31, the nozzle 32, the spool 12 </ b> B, the runner 12 </ b> A, and the cavity 10. Under this condition, the servo motor 37 is operated to push the piston 36 in the cylinder 34. Thereby, the molten soap filled in the cylinder 34 is pressurized and injected into the cavity 10 of the mold 1 through the supply path. As described above, the supply amount of the molten soap is determined by the stroke amount of the piston 34, but the stroke amount is precisely controlled by the servo motor 37. Such molten soap supply operation is performed substantially simultaneously in each of the plurality of cavities 10. As each of the cavities 10 is filled with the molten soap, the air in the cavities 10 is discharged to the outside from the air vent 15 and replaced with the molten soap. In the mold 1, the molten soap is filled upward from the lower portion of the cavity 10 through the injection space 12 (runner 12 </ b> A and spool 12 </ b> B), so that the defoaming of the molten soap is performed more reliably.

  In this embodiment, as shown in FIG. 12, the molten soap is filled not only into the cavity 10 but also into the injection space 12 (runner 12A and spool 12B) leading to the cavity 10. Only the molten soap filled in the cavity 10 is finally made into a product, but the amount of molten soap injected is made larger than the volume of the cavity 10 and the molten soap is filled in the injection space 12 as well. This prevents shrinkage and sink marks during solidification, and prevents the occurrence of soap distortion and dirt, which have been a problem in conventional so-called gate pin type soap manufacturing methods. Soap can be obtained.

  When supply of a predetermined amount of molten soap to each cavity 10 and each injection space 12 is completed, the push-in valve 33 in each injection part 39 is completely inserted into the nozzle 32 again (see FIG. 10). Then, under this state, the molten soap in the mold 1 is cooled and solidified. As described above, the first mold 1 </ b> A and the second mold 1 </ b> B are cooled to a predetermined temperature by circulating the cooling water, and this facilitates the cooling and solidification of the molten soap in each cavity 10 and each injection space 12. .

  When the molten soap is solidified, as shown in FIG. 13, the injection means 3 is retracted to remove the injection means 3 from the second mold 1B, and the servo motor 22 is operated to retract the feed screw 23, so that both molds 1A , 1B is opened. At this time, suction is performed through the cavity forming surface 11A of the first mold 1A and the slit 13 (see FIG. 2) formed in the runner forming surface. At the same time, air is blown from the cavity forming surface 11B toward the solid soap S through the slit 13 formed in the cavity forming surface 11B of the second mold 1B, thereby releasing the solid soap S from the cavity forming surface 11B. Promote. By these operations, each soap bar S is held on the cavity forming surface 11A of the first mold 1A and the runner forming surface. There is no particular restriction on the time when the mold 1 is opened after cooling and solidification of the molten soap, but at an earlier stage than when the soap is solidified and then opened, for example, the surface layer of the soap is solidified. However, if the mold is opened while the inside is not solidified, the soap is surely held on the split mold 1A side.

  Subsequently, each solid soap S held in the first mold 1A is taken out by a predetermined gripping means (not shown). At this time, air is blown toward the solid soap S from the cavity forming surface 11A and the runner forming surface through the slits 13 formed in the first die 1A, and the release of the solid soap S from the die 1A is promoted. . In this way, a plurality (12 in this embodiment) of the soap bars S can be obtained simultaneously.

  Thereafter, both molds 1A and 1B are closed and returned to the state shown in FIG. 9, and the operations described so far are repeated, but in order to remove unnecessary items such as soap scum adhering to the inside of the mold 1 Before the molds 1A and 1B are closed, the parting surfaces PL of both the molds 1A and 1B (the cavity forming surfaces 11A and 11B of both molds 1A and 1B and the air vent 15 of the mold 1A) are heated with hot water or a cleaning brush. Use to wash. In the present embodiment, as described above, the formation region of the air vent 15 is a concavo-convex portion including the linear groove 18 and the chevron 19 that are straight and continuous. By spraying warm water along the groove 18 or operating a cleaning brush, it is possible to efficiently and surely remove unnecessary items such as soap scum. Thus, as a method of cleaning the mold 1 after use, the parting surface of one mold 1A of the molds 1A and 1B without matching both the molds 1A and 1B with their parting surfaces PL. An effective method is to expose the formation area of the air vent 15 in the PL, and spray hot water or operate a cleaning brush along the linear groove 18 in the exposed air vent formation area.

  As shown in FIG. 14, the solid soap S taken out from the mold 1 in this way is melted in the portion S1 where the molten soap is solidified in the cavity 10 and in the injection space 12 (runner 12A and spool 12B). And a portion S2 where the soap is solidified. On the other hand, in the so-called gate pin type manufacturing method, the molten soap in the injection space (the gate) is already pushed out into the cavity by the gate pin at the time of starting the cooling and solidification of the molten soap, so that it is removed from the mold. The solid soap which consists of only part S1 does not contain part S2. The soap obtained by such a gate pin method is likely to generate stains due to distortion or abrasion of the inner surface of the gate at the site located around the gate due to the extrusion operation of the residual molten soap by the gate pin. There's a problem. In the present embodiment, such a problem in the gate pin method is solved by providing the portion S2 in the solid soap S taken out from the mold 1.

  After the solid soap S is taken out from the mold 1, the boundary between the part S1 and the part S2 is cut by a predetermined cutting means (not shown), and the part S1 is used as a final product. Part S2 can be recovered and used for the production of new bar soap.

  Examples of the ingredients constituting soap (molten soap, solid soap) include fatty acid soaps, nonionic surfactants, inorganic salts, polyols, nonsoap anionic surfactants, free fatty acids, fragrances, water, etc. Is mentioned. Furthermore, additives such as antibacterial agents, pigments, dyes, oil agents, plant extracts and the like may be appropriately blended as necessary.

  15 and 16 show a part of a molding die 4 which is another embodiment of the molding die according to the present invention. In addition, about embodiment mentioned later, the component different from the said embodiment is mainly demonstrated, the same code | symbol is attached | subjected to the same component, and description is abbreviate | omitted. The description of the above embodiment is applied as appropriate to components that are not particularly described. FIG. 15 shows a part of the molding die 4, and the molding die 4 has a plurality of molding cavities 10 filled with molten soap (liquid raw material), similar to the molding die 1 described above. (12 pieces) The basic structure is the same as that of the mold 1 (see FIGS. 2 and 3).

  In the molding die 4, a part 1A1 of the first die 1A (one die) (a portion including the air vent 15 forming region in the die 1A) abuts against the parting surfaces PL of both the die 1A and 1B. 10A is attached to the other part 1A2 of the mold 1A so as to move following the movement of the second mold 1B (the other mold) in the butting direction X. More specifically, the part 1A1 of the first mold 1A is attached to the other part 1A2 of the mold 1A via an elastic member 41 (in this embodiment, a coil spring) that expands and contracts in the butting direction X. The movable member 41 is movable in the butting direction X as the elastic member 41 expands and contracts.

  The molding die 4 will be further described. A housing recess for housing the elastic member 41 on the surface facing the other portion 1A2 (the surface opposite to the parting surface PL) in the part 1A1 of the first mold 1A. 42 is formed, and one end of the expansion / contraction member 41 is fixed to the bottom of the accommodation recess 42, and the other end of the expansion / contraction member 41 is fixed to a portion of the other portion 1A2 facing the bottom of the storage recess 42. Has been. In a state where the part 1A1 of the first mold 1A is not pressed to the other part 1A2 side (the state where the first mold 1A and the second mold 1B are not abutted), the elastic member 41 is in a natural state. In the natural state of the elastic member 41, the facing surface of the part 1A1 facing the other part 1A2 and the other part 1A2 are separated by a distance T1 as shown in FIG. The parting surface PL (formation region of the air vent 15) of the part 1A1 protrudes on the opposite side (second mold 1B side) from the other part 1A2 by the distance T1 from the parting surface PL of the other part 1A2. It is made like that. Further, in the present embodiment, in order to prevent the part 1A1 of the first mold 1A and the other part 1A2 from separating beyond the distance T1 in the natural state of the elastic member 41, the part 1A1 is replaced with the other part. 1A2 is engaged with a rod-like engagement member 43 standing from a surface facing the part 1A1. The part 1A1 has an engaging portion 44 in which one end portion of the engaging member 43 is accommodated therein, and the one end portion of the engaging member 43 is not detached from the engaging portion 44 and is engaged. The inside of the joint portion 44 is slidably accommodated in the butting direction X.

  As shown in FIG. 15 with respect to the parting surface PL of the first mold 1A in a state where the elastic member 41 is in a natural state and a part 1A1 protrudes on the opposite side to the other part 1A2 as shown in FIG. When the parting surface PL of the second mold 1B is abutted to form the cavity 10, a part 1A1 of the initially projected mold 1A is contracted by the expansion and contraction member 41 due to the pressing of the mold 1B. When the cavity 10 is formed, it is brought into close contact with the other portion 1A2 (the distance T1 becomes 0). Also, as shown in FIG. 15, when the molds 1A and 1B are brought into contact with each other (the state where the cavity 10 is formed), when the molds are opened, the contracted state of the elastic member 41 is released, as shown in FIG. Thus, a part 1A1 of the mold 1A protrudes.

  The same effect as the mold 1 can be obtained by the mold 4. In particular, the mold 4 is configured such that a part 1A1 of the first mold 1A in which the air vent 15 is formed is movable following the movement of the both molds 1A and 1B in the butting direction X. , 1B just by abutting with their parting surfaces PL, the clearance of the plurality of air vents 15 communicating with the plurality of (in this embodiment, 12) cavities 10 formed in the mold 4 can be adjusted appropriately, and the clearance Therefore, productivity is further improved.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, the number and arrangement of the cavities 10 in the molds 1 and 4 are not limited to the above embodiment, and can be set as appropriate. Further, although the molds 1 and 4 have a plurality of cavities, the mold of the present invention may have only one cavity. Moreover, in the said embodiment, although the air vent 15 was formed in the movement type | mold (1st type | mold 1A), you may be formed in the fixed type | mold (2nd type | mold 1B). All the parts of only the one embodiment described above can be used together as appropriate.

  The following additional notes (molding die) are further disclosed with respect to the embodiment of the present invention described above.

<1> A first mold having a parting surface and a second mold are provided, and the first mold and the second mold are brought into contact with each other by their parting surfaces to be molded inside. And an air vent for discharging the air in the cavity are formed, and the injection space is located below the cavity, and the air vent is located above the cavity. A plurality of linear grooves extending along the air discharge direction in the air vent formation region on the parting surface of one of the two molds; and In a cross-sectional view along the orthogonal direction, a chevron is formed between the two linear grooves that are formed continuously without being spaced in the orthogonal direction orthogonal to each other and that are adjacent to the orthogonal direction. The line groove The one mold is cut inward in the thickness direction, and the chevron protrudes outward in the thickness direction, and the both molds on the parting surface of the other mold of the two molds. When the cavity is formed by abutting the parting surfaces of each other, the groove facing region that faces the plurality of linear grooves is flat.

<2> The soap mold according to <1>, wherein the tops of the plurality of chevron protrusions are located at positions lower than the parting surface of the one mold.
<2-1> The distance (clearance) from the parting surface of the top of the chevron is preferably 5 μm or more, more preferably 10 μm or more, and preferably 25 μm or less, more preferably 20 μm or less, more specifically. The soap mold according to the above <2>, which is preferably 5 μm or more and 25 μm or less, more preferably 10 μm or more and 20 μm or less.

<3> The soap mold according to <1> or <2>, wherein the depth of the linear groove is 10 μm or more and 60 μm or less, and the pitch of the linear groove is 80 μm or more and 200 μm or less.
<3-1> The depth of the linear groove is preferably 10 μm or more, more preferably 30 μm or more, and preferably 60 μm or less, more preferably 50 μm or less, more specifically, preferably 10 μm or more and 60 μm or less, More preferably, it is 30 μm or more and 50 μm or less, and the pitch of the linear groove is preferably 80 μm or more, more preferably 100 μm or more, and preferably 200 μm or less, more preferably 150 μm or less, more specifically, preferably The soap mold according to <3>, which is 80 μm or more and 200 μm or less, more preferably 100 μm or more and 150 μm or less.
<3-2> The number of the linear grooves in the air vent formation region of the parting surface is preferably 50 or more, more preferably 66 or more, per unit area of a square shape of 1 cm square, and Any one of the above items <1> to <3>, preferably 125 or less, more preferably 100 or less, more specifically, preferably 50 or more and 125 or less, and more preferably 66 or more and 100 or less. 1. A soap mold according to 1.

<4> The soap mold according to any one of <1> to <3>, wherein an angle of a bottom portion of the linear groove and an angle of a top portion of the chevron are 67 ° or more and 169 ° or less, respectively. .
<4-1> The angle of the bottom of the linear groove and the angle of the top of the chevron are preferably 67 ° or more, more preferably 80 ° or more, and preferably 169 ° or less, more preferably 100. The soap mold according to the above <4>, which is not more than °, more specifically preferably not less than 67 ° and not more than 169 °, more preferably not less than 80 ° and not more than 100 °.

<5> The one mold includes the air vent formation region on the parting surface, and a part of the one mold is detachably attached to the other part of the one mold. The soap mold according to any one of <1> to <4>.
<5-1> The clearance adjustment (fine adjustment) of the air vent is processed to a desired thickness on the surface opposite to the parting surface of a part of the one mold (including the air vent formation region). The soap mold according to any one of <1> to <5>, wherein the mold is adjustable by mounting a single thin plate or a plurality of thin plates.

<6> A portion of the one mold is movable so as to move following the movement of the other mold in the butting direction when the parting surfaces of both molds are butted to form the cavity. The soap mold according to <5>, which is attached to the other part of the mold.
<6-1> A part of the one mold is attached to the other part of the one mold via an elastic member that expands and contracts in the abutting direction. The soap mold according to <6>, wherein the mold is movable in a direction.

<7> The method for manufacturing a mold according to any one of <1> to <6>, wherein the linear groove and the chevron are not formed in a region where the air vent is formed on a parting surface. And a step of manufacturing a mold precursor, and a step of cutting an air vent forming region on the parting surface of the mold precursor to form the linear groove and the chevron in the forming region. A method for manufacturing a mold.

<7-1> In the cutting step, the mold precursor is set so that the parting surface thereof is horizontal, and the linear grooves and the chevron projections are formed on the horizontal parting surface using a V cutter. The method for producing a mold according to <7>, wherein a predetermined number of each is formed.
<7-2> In the cutting step, the mold precursor is set so that the parting surface is inclined by 45 ° with respect to a horizontal plane, and the inclined parting surface is obtained using a general-purpose end mill. The method for producing a forming die according to <7>, wherein a predetermined number of the linear grooves and the chevron protrusions are respectively formed on the die.

<8> In the cutting step, the die precursor is cut to obtain a die in which the linear groove and the chevron are formed in the air vent formation region on the parting surface. <7> The mold according to <7>, wherein one mold constituting the mold is manufactured by performing processing or the like, wherein the linear groove and the chevron are formed in an air vent formation region on the parting surface Manufacturing method.

<9> The method for cleaning a molding die according to any one of <1> to <6>, wherein the one of the two types is not abutted on the parting surfaces thereof. A molding die cleaning method in which an air vent formation region on the parting surface of the die is exposed, and hot water is sprayed or the cleaning brush is operated along the linear groove in the exposed air vent formation region.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example Production Example 1]
By using a manufacturing apparatus (molding die) having the same basic configuration as the soap manufacturing apparatus 5 shown in FIG. 1, a series of operations are repeated a number of times in accordance with the above-described solid soap manufacturing method, whereby a large number of solid soaps are continuously produced. Manufactured. As a liquid raw material (molten soap), a soap content of 38% by mass, an auxiliary component such as a moisturizing agent, 31% by mass, a moisture of 29% by mass, a fragrance and other 2% by mass composition ratio were used. The dimensions and manufacturing conditions of each part of the manufacturing equipment are as follows.
-Depth of linear groove (height of chevron) D1 (see FIGS. 6 and 7): 40 μm
-Line groove pitch D2 (see FIGS. 6 and 7): 125 μm
The angle α at the bottom of the line groove and the angle β at the top of the chevron (see FIGS. 6 and 7): 90 °
-Distance T from the parting surface of the top of the chevron protrusion (see FIG. 6) [Air vent clearance T (see FIG. 4)]: 15 μm
-Number of linear grooves in the air vent formation area of the first mold (one mold) parting surface: 80 per square unit of 1 cm square

[Comparative Production Example 1]
As the first mold (one mold), as in the mold 1A ′ shown in FIG. 8, no grooves or protrusions are formed in the formation area of the air vent 15 on the parting surface PL, and the formation area is not uneven. A number of bar soaps were continuously produced in the same manner as in Example 1 except that a flat portion was used.

[Evaluation]
If burrs are generated in the product (solid soap) during continuous operation of the manufacturing equipment, the filling pressure in the mold cavity will increase, and the product mass will tend to vary widely. Are correlated. Therefore, in order to evaluate the degree of occurrence of burrs in the products obtained in the practical production examples and the comparative production examples, the mass of a large number of products obtained in each example was measured, and the standard deviation (product mass in the product standard mass of 90 g) was measured. The standard deviation of the practical manufacturing example is 0.71 (2560 samples used for the specimen), and the standard deviation of the comparative manufacturing example is 0.94 (2200 samples used for the specimen). In the production example, the standard deviation was smaller and the generation of burrs was suppressed. The filling pressure was measured by installing a pressure sensor at the tip of the filling piston of the production apparatus (corresponding to the valve 33 of the production apparatus 5), and the peak pressure measured by the pressure sensor was used as the filling pressure. As a result, the filling pressure of the implementation example was 82 kPa, and the filling pressure of the comparative example was 74 kPa. There was no significant difference in the filling pressure (peak pressure) between the two examples. Even if linear grooves and chevron projections are formed in the air vent formation region on the parting surface of the mold, the amount of increase in the filling pressure (difference from the filling pressure in the comparative manufacturing example) is small and is substantially equal to the filling pressure. It is understood that the inconvenience related to the filling pressure hardly occurs. Although the cross-sectional area of the air vent is the same in the practical manufacturing example and the comparative manufacturing example, in the practical manufacturing example, the contact area between the air vent and the liquid raw material is increased as compared with the comparative manufacturing example. It is estimated that the burr growth was suppressed. The fact that the filling pressure of the example of production is higher than that of the comparative example of manufacture is a phenomenon caused by the increased resistance to air leakage due to the formation of linear grooves and chevron projections in the air vent. . However, the amount of increase is not in the range that causes a problem from the filling performance.

1,4 Mold 1A, 1A '1st type | mold 1A1 A part of 1st type | mold (part containing the formation area of the air vent in a parting surface)
1A2 Other part of the first mold 1B Second mold 1B1 Groove facing area 2 Mold opening / closing means 3 Injection means 5 Soap manufacturing apparatus 10 Cavity 11A, 11B Cavity forming surface 12 Injection space 12A Runner 12B Spool 15 Air vent 18 Line Groove 19 Angle protrusion 41 Elastic member

Claims (6)

A first mold having a parting surface and a second mold, and the first mold and the second mold are brought into contact with each other by their parting surfaces; An injection space of liquid raw material leading to the cavity and an air vent for discharging air in the cavity are formed, and the injection space is located below the cavity, and the air vent is located above the cavity. A mold,
A plurality of linear grooves extending along the air discharge direction in the air vent formation region on the parting surface of one of the two molds are not spaced apart from each other in a direction orthogonal to the discharge direction. Are formed between the two linear grooves adjacent to each other in the orthogonal direction, and in the cross-sectional view along the orthogonal direction, the linear groove is the one of the linear grooves. Cut inward in the thickness direction of the mold, the chevron protruding outward in the thickness direction,
In the parting surface of the other of the two molds, the groove facing region facing the plurality of linear grooves when the parting surfaces of the two molds are brought into contact with each other to form the cavity is flat. Soap mold.   2. The soap mold according to claim 1, wherein the tops of the plurality of chevron projections are located at positions lower than the parting surface of the one mold.   The soap mold according to claim 1 or 2, wherein a depth of the linear groove is 10 µm or more and 60 µm or less, and a pitch of the linear groove is 80 µm or more and 200 µm or less.   The soap mold according to any one of claims 1 to 3, wherein an angle of a bottom portion of the linear groove and an angle of a top portion of the chevron are 67 ° or more and 169 ° or less, respectively.   The one mold includes a region where the air vent is formed on a parting surface, and a part of the one mold is detachably attached to the other part of the one mold. The soap mold according to any one of 1 to 4.   Part of the one mold is movable so as to follow the movement of the other mold in the butting direction when the parting surfaces of both molds are butted to form the cavity. The soap mold according to claim 5, which is attached to other portions.

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